Google Scripts: keep spreadsheet data up to date in variable places in Google doc

When a row is added or edited on any of these three source spreadsheets...

https://docs.google.com/spreadsheets/d/1cUFJz0nippnHge1byNeIubbRh0sggEBcKufcyMqT_iI/edit#gid=1777582606 (Bronze Raw Data 10_27 copy)

https://docs.google.com/spreadsheets/d/1ul-k-ZRY_7hkkescMQxfkPTZ0dZjkVKACBSPSkrd92I/edit#gid=1711134167 (Silver Raw Data 10_27 copy)

https://docs.google.com/spreadsheets/d/1Au8tVQQeSH3bgUeEvqE_XJBv5krAYJs8FCMy-fxQD7c/edit#gid=2123049995 (Gold Raw Data 10_27 copy)

.... Add or edit the following at a variable location...

[{Event Title}; {Your Name}] {Event Start Date in [login to view URL]}; {What is this event all about?}

>> {Event Start Date / Time} at {Location}

... on this Document.

[login to view URL] (Master Sunday Announcements)

The variable is the number of weeks prior to {Event Start Date in [login to view URL]}, on a Sunday:

Gold: 8 weeks prior to the event start date

Silver: 5 weeks prior to the start date

Bronze: 3 weeks prior to the start date

...And, in each case, add

[{Event Title}; {Your Name}] {Event Start Date in [login to view URL]};

to every Sunday leading up to the start date, inclusive.

The Google Doc needs to stay up to date if ever an existing event in the Spreadsheet is manually edited.

JavaScript

Projektin tunnus: #14695145

Tietoa projektista